Sight Sciences (NASDAQ:SGHT – Get Free Report) was upgraded by equities research analysts at William Blair to a “strong-buy” rating in a report released on Friday,Zacks.com reports. A number of other brokerages have also recently issued reports on SGHT. Citigroup increased their price objective on shares of Sight Sciences from $5.50 to $9.10 and gave the company a “neutral” rating in a research note on Thursday, December 11th. Morgan Stanley inc…